ATW Centurion 100KM Triathlon Box End

The ATW Centurion 100KM Triathlon Box End is a long-distance multisport event held at Box End Lakes near Bedford. The Metric Centurion format comprises a lake swim, an extended non-draft road bike leg and an off-road run, and several shorter triathlon and aquabike options are held on the same day. The course is described by the organiser as well marked with strong marshal support and scenic lakeside and country-road sections, with route maps provided on the event site. The event offers on-site camping and an event village to support competitors and spectators.

Participants receive a custom finisher medal and complimentary event photos, and finish-line snacks are provided. Time cut-offs are published for each discipline and an overall limit is applied to the Centurion distance; wetsuit hire options are offered via partners for open-water swim competitors. The organiser, Active Training World (ATW), publishes a transgender inclusion policy and clear non-drafting rules for the Centurion bike leg. Practical information including parking, route maps and an FAQ page are available from the official event pages.